1Research on Real-time Dynamic Path Planning for Mine Fire Escape with Improved Bidirectional A* AlgorithmZHANG ShunDesign and Research1-52Research on Static and Dynamic Characteristics of Digital Proportional Valve for Coal Mine Underground Drilling RigDANG Jian, TIAN Hongliang, YAO YafengDesign and Research6-10,313Design of an Automatic Testing System for Mining Wind Speed Sensors Based on a Circular Wind TunnelZHANG Yajun, CHU WeizhongDesign and Research11-144Research on Power Battery Monitoring System of Mine Electric Monorail CraneFANG Tonghui, ZHOU Hang, CHEN Yongpu, YIN Keqiang, DENG HaishunDesign and Research15-195Hardware Circuit Design on 5G Intelligent Controller of Coal Winning Machine Based on RK3568ZHOU YongDesign and Research20-266Design on a Main Controller of Coal Winning Machine with 5G Communication TechnologyREN WenhuaDesign and Research27-317Research on Permeability Testing Equipment of Polymer Material for Water Shutoff in Coal MineXU RichengIssue Discussion32-36,418Design of a Centralized Monitoring System for Underground Nitrogen Production Equipment Based on PLCWANG LinglongIssue Discussion37-419Design and Implementation of 3D Dynamic Monitoring Interface for RoadheaderWANG YachaoIssue Discussion42-45,4910Design and Application of Integrated Rotating Device for Mining Cable Installation Bracket WeldingDING Chuanyu, CHEN FeiIssue Discussion46-4911Research on Chamber Excavation Technology of Pneumatic Material Transfer Station in Guqiao Coal MineLI XutaoIssue Discussion50-53,5812Research and Application of Dynamic Carriage Information Perception Technology for Railway Intelligent LoadingCUI YisenIssue Discussion54-5813Calculation and Analysis of Initial Clearance of Double Row Tapered Roller Bearings in the Cutting Section of a Coal Winning MachineKAN JinbiaoTechnical Practice59-6114Structural Design of a Hydraulic Control Clutch Tensioning Chain Device for Scraper ConveyorLI Meichai, JI MingjunTechnical Practice62-6615Flow Field Simulation and Structural Optimization of a Backwash EjectorTANG Kun, TAO Zhen, WEI YiTechnical Practice67-7016Application of MB670 Excavator Anchor Integrated Machine Adapting to Kuanghong SystemSHEN Qiuyan, ZHANG Xiaogang, CAO PeixinTechnical Practice71-73,7717Development of Rust Removal Device for Underground Contact Line in Coal MineZHAO YUANTechnical Practice74-77 